- Which faction is stronger? (Necropolis, Tower, or Conflux)

If we consider the question of which castle is better in the early stages of development, then the one with archers is the best, and that would be the Tower and the Conflux. Given that the Conflux has archers of the second level, it is clear that the Conflux is more powerful than the Tower. Necropolis is not very good in the early stages – both skeletons and zombies are slow and won't be able to reach the enemy.
Looking further ahead... I read somewhere that the best castle against the Conflux is the Tower (due to magic). But I won't venture to judge on later stages.